People from all over the Bay Area came to rally outside Senator Dianne Feinstein's San Francisco office after the House narrowly passed the GOP's health care bill.

Feinstein said she's 100 percent opposed to the bill and says it's outrageous that House Republicans passed it given the fact that nobody fully understands how the bill will affect Americans or how much it will cost.

Kendrick Lewallen is one of the many Americans who is concerned the new American Health Care Act will strip protections from millions of people, like he and his mother who have pre-existing conditions and, until the ACA was passed, could not get health insurance.

"I lost my healthcare because of my pre-existing conditions and I'm very emotional about this. My mother almost died from cancer and if it wasn't for Obamacare, she wouldn't be here today," Lewallen said.

But Jason Clark, chairman of the San Francisco Republican Party, believes the new bill will pass when it goes to the Senate. "I think it's a tremendous opportunity," he said. "So many people have seen their premiums skyrocket under the current bill and I think this is a tremendous opportunity to sort of reverse that."

Clark says President Trump's healthcare bill failed in March because, "the first attempt was too rushed."

But Democrats say this latest bill is even worse, with no opportunity for non-partisan analysis by the congressional budget office.